<?php
/*
 * The MIT License
 * 
 * Copyright (c) 2009 David Neu
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

class GpxFile {
    
    private $file;
    private $data;
    private $xml;
    
    public function __construct($fileName) {
        if (!is_file($fileName) || !is_readable($fileName)) {
            throw new Exception('File not readable '.$fileName);
        }
        $this->file = $fileName;
        $this->data = file_get_contents($this->file);
        $this->xml = new SimpleXmlElement($this->data);
    }
    
    public function getModificationTime() {
        return filemtime($this->file);
    }
    
    public function getTrackCount() {
        return count($this->xml->trk);
    }
    
    public function getWaypointCount() {
        return count($this->xml->wpt);
    }
    
    public function getTrackpointCount() {
        return substr_count($this->data, '<trkpt ');
    }
    
    public function getTrackNames() {
        $xml = simplexml_load_file($this->file);
        $res = array();
        foreach ($xml->trk as $trk) {
            $res[] = (String)$trk->name;
        }
        return $res;
    }
    
    public function getFirstTime() {
        $time = strtotime((String)$this->xml->trk[0]->trkseg[0]->trkpt[0]->time);
        if ($time == 0) {
            $time = strtotime($this->xml->metadata[0]->time);
        }
        return $time;
    }
    
    public function getFilename() {
        return $this->file;
    }
}
?>